Tackle-block.



W. H STAM.

TACKLE BLOCK.

APPLIOATION Plum MAY 14, 1909.

Paten ted Aug.30,1910.

THE NORRIS PETERS co" WASHINGTON, n. c

WILLIAM H. STAM, or VERDI, NEVADA.

TACKLE-BLOCK.

Specification of Letters Patent.

Patented-Aug. 30, 1910.

Application filed May 14, 1909. Serial No. 496,025.

To all whom it may concern:

Be it known that I, lVILLIAM H. STAM, a citizen of the United States,residing at Verdi, in the county of Washoe and State of Nevada, haveinvented certain new and useful Improvements in Tackle-Blocks, of whichthe followin is a specification.

This invention reiates to tackle blocks and refers particularly to aspecific construction of the same.

An object of the invention is to provide an improved tackle block whichpermits of an intermediate portion of the cable to be entirelydisengaged from the same by slipping it laterally fromthe pulley orsheave which is mounted therein.

The invention further contemplates the provision of a block of thischaracter by'the use of which a great saving of time may be effected asthe intermediate portion of the cable may be removed without slackeningthe same and without releasing the tension of the shifting portions ofthe cables.

For a full understanding of the invention reference is to be had to thefollowing description and accompanying drawings, in which Figure 1 is aside elevation of the improved block. Fig. 2 is a vertical longitudinalsection through the same. Fig. 3 is an end View showing the block in anopen position, and Fig. 4 is a top plan view.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the accompanying drawingsby the same reference characters.

Referring to the drawings, in which is disclosed the preferredembodiment of the invention, the numeral 10 designates the sheave orpulley which is mounted within the improved shell or casing. The shellcomprises two side plates 11 and 12, which are disposed in parallel andwhich are provided with tongues 13 and 14, the tongues being curved uponthemselves to form bearings for a pintle 15. The side plate 12 is curvedinwardly at its lower extremity and extended to the lower end of theside plate 11 where the tongues 13 and 14 are curved and engaged by thepintle 15. The side plate 12 is provided with a web 16 which is formedwith a suitable tongue to engage about the pintle 15 in order topivotally support the same, the web 16 being disposed in parallel withthe side plate 11 and cooperating therewith to support a pin 17 whichpasses centrally through the sheave 10 to rotatably support the same.The pin 17 is provided upon one end with an annular shoulder 18 forengagement against the outer face of the web 16 to limit thelongitudinal movement of the pin 17 therethrough, the pin 17 beingthreaded at its opposite extremity, upon which a suitable clamping nut19 is positioned, which serves to draw the pin 17 through the web 16 andside plate 12 in order to clamp the same against the opposite sides ofthe sheave 10.

The side plate 11 is rectangularly looped .at its upper extremity toform a cross-arm 20 through which a swivelly mounted hook 21 ispositioned, and to form a cross-brace 22 for the purpose of reinforcingthe shell. The upper extremity of the side plate 11 is curved downwardlyand positioned against the inner face of the side plate 11 where it issecured thereto by the employment of suitable rivets or the like. Theabutment 23 which is formed upon the looped portion of the side plate 11receives the upper extremity of the side plate 12 which is retained insuch position thereagainst by means of a locking pawl 24. The lockingpawl 24 is carried by the abutment 23 and extended downwardly therefromto engage against the upper end of the plate 12. The pawl 24 is retainedin position by means of a rod 25 which is disposed transversely throughthe looped portion and terminated at its opposite ends in the plate 11and the pawl 24. A washer 26 isdisposed about the rod 25 to space thepawl 24 from the abutment 23 to thereby admit of the positioning of theupper end of the side plate 12 therebetween. The locking pawl 24 is sodisposed that when the same is positioned longitudinally of the abutment23 the extremity of the pawl 24 is engaged against the outer face of theplate 12 and retains the same against the abutment 23 tolock the blockin a closed position. The pawl 24 is provided with an indentation 27which is formed in its inner face adjacent its outer end to receive aprojection 28 which is outwardly extended from the central portion of aleaf spring 29. The leaf spring 29 is secured across the upper end ofthe abutment 23 to frictionally retain the locking pawl 24 in a closedosition, the sprin 20 being bowed outwar ly at its intermediate portionand retained in such position by the riveting of the ends of the same tothe abutment 23. To further the stability of the shell a stud 30 isdisposed upon the lower end of the abutment 23 and extended outwardlytherefrom for engagement in an aperture formed through the side plate 12to prevent the sagging of the plate 12 upon the disposition of a tensionupon the sheave it).

In operation. when it is desired to engage a portion of a cable over thesheave 10 the locking pawl 2% is partially rotated to disengage theinner end of the same from the upper extremity of the side plate 12 andto thereby permit the swinging downwardly of the same about the pintle15. The web 16, by reason of its connection with the pin 17 is likewisedrawn downwardly and retained in parallel relation to the plate 12,admitting of the reception of the cable within the curved periphery ofthe sheave 10, the cables being positioned over the upper end of theside plate 1.2 and the web 16. The locking pawl is then returned to itsformer position whereupon the outer extremity of the same is engagedover the stud or projection 28 carried upon the leaf spring 29.

The side plate 11 is apertured at a point which is opposite to the innerend of the pin 17 and in order to admit of the closing of the sides 11and 12 and to further form a support for the pins upon which the sheavesor pulleys are mounted.

Having thus described the invention what is claimed as new is 1. Atackle block including a plate, a second plate hingedly connected tosaid first plate, a web concentrically pivoted between said plates andpositioned against the inner side of said first plate, a pin carried bysaid web and said second plate, a sheave mounted on said pin and meansfor locking said plates together at their upper ends.

2. A tackle block including a pair of hinged plates, a webconcentrically pivoted between said plates, a pin connected by said weband one of said plates, a shoulder on said pin for engagement againstthe outer face of said web, a threaded portion on the opposite end ofsaid pin for engagement through one of said sides, a nut positioned uponsaid threaded portion against theouter face of the side, means forlocking said plates in a closed position, and a sheave located aboutsaid pin.

3. A tackle block including a plate, an angular loop formed upon theupper end of said plate, a second plate hinged to said first plate atthe lower end thereof, said second plate having an angled portion at thelower end thereof to dispose the same in parallel relation to said firstplate when swung into an upward position, a web concentrically pivotedbetween said plate and engaged against said first plate, a sheaveloosely disposed between said web and said second plate, and lockingmeans carried by said leaf for engagement with said second plate.

In testimony whereof I afiix my signature in presence of two witnesses.

WVILLIAM H. STAM.

